The complete lineage of preservation science.
1702
Antonie van Leeuwenhoek reports that rotifers removed from dry moss and placed in water resume movement within hours — the first recorded observation of an organism returning from apparent death by drying.
1776
Lazzaro Spallanzani systematically demonstrates that rotifers, tardigrades, and other minute animals survive total desiccation and reanimate upon rehydration, establishing "return from apparent death" as a biological phenomenon.
1940
Basile Luyet's treatise introduces vitrification — the transformation of water into an amorphous glass rather than crystalline ice — as the central theoretical framework for understanding how living systems might survive freezing.
1949
While attempting to freeze fowl spermatozoa, Arthur Polge accidentally uses a bottle mislabeled as containing a different solution. The sample contains glycerol. The sperm survive. Cryoprotective agents enter biology by mistake.
1959
In his Leeuwenhoek Lecture, David Keilin proposes cryptobiosis — "hidden life" — as the umbrella term for the reversible suspension of metabolism in response to extreme desiccation, cold, or anoxia.
1972
Mouse embryos are successfully cryopreserved and brought to term — the first demonstration that a mammalian embryo can survive freezing, thawing, and normal development.
1980s
John and Lois Crowe show that the disaccharide trehalose replaces water in the membranes and interiors of desiccation-tolerant organisms, forming a stable glass that prevents collapse during drying.
2008
The TARDIS experiment aboard FOTON-M3 exposes desiccated tardigrades to the vacuum and radiation of low Earth orbit. A substantial fraction survive and reproduce after return.
2016
A moss sample collected in Antarctica in 1983 yields a living tardigrade upon thawing — thirty years of suspended animation with no detectable damage.
2017
Tardigrade-specific intrinsically disordered proteins (CAHS) are shown to be necessary and sufficient for desiccation tolerance, forming protective glasses around cellular components during drying.
2021
A living bdelloid rotifer is recovered from Siberian permafrost dated to the late Pleistocene. It reproduces asexually after thawing.
2023
A previously unknown nematode species is isolated from permafrost dated to 46,000 years before present. Upon rehydration it moves, eats, and reproduces.